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Combined with all the above descriptions, we can summarize the process of data packets passing through the firewall as follows:上世纪初，军阀吴大帅攻打下石头城后，梦想做皇帝。军师半梦道人妄图夺取浮屠秘术，假借改命之说，引祸郎中德一，圆大帅皇帝梦。德一为报师们和妻女之仇，也为世间不再生灵涂炭，利用景侍卫巧妙布局设套。最终，半梦道人作茧自缚，大帅命丧黄泉。可以说项伯在整个鸿门宴过程中，给刘邦的帮助绝对不小，是至关重要的。Tin or gold plating to ensure reliable contact and prolong the service life of the probe.2029The above is only a model of "Long En" bicycle, If you need to generate other types of bicycles, Other subclasses can be written. The most important advantage of factory mode is that some of the same methods can be implemented. We can write code in the parent class for these same methods. If we need to implement specific business logic, we can rewrite the parent class's methods in the subclass to implement our own business logic. In terms of professional terms, there are two points: First, weaken the coupling between objects and prevent code duplication. Instantiating a class in a method eliminates repetitive code. Second: Repetitive code can be written in the parent class. Subclasses inherit all member attributes and methods of the parent class. Subclasses only focus on implementing their own business logic.